Comprehensive simulation load experiment method for roll-on and roll-off equipment lifting platform

Abstract

The invention provides a roll-on and roll-off equipment lifting platform comprehensive simulation load experiment method which specifically comprises the following steps: step 1, symmetrically arranging loads along a longitudinal central axis and a transverse central axis of a lifting platform to enable the center of the loads to be consistent with the center of the lifting platform, step 2, lifting the lifting platform for multiple times for the first time, step 3, lifting the lifting platform for multiple times for the second time, the center of the load is adjusted by an offset distance L in the first direction by inclining the lifting platform by an angle alpha along the first axis, the fourth step of lifting the lifting platform for multiple times for the second time, the fifth step of inclining the lifting platform by an angle beta along the second axis, the gravity center of the load is adjusted by an offset distance L, and the sixth step of lifting the lifting platform for multiple times for the third time. Through the steps, various working conditions of an actual vehicle device can be simulated, and the deviation of the vehicle and the inclination state of the ship are unified together for verification, so that the most comprehensive and most actual use condition of the lifting platform is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a comprehensive simulated load test method for a roll-on / roll-off equipment lifting platform. Background Art

[0002] RoRo ships are ships that can be loaded or unloaded by vehicles or wheeled equipment by pedals. For example, vehicles can be transported by road or sea. On land, they can be transported by rail or road. For larger distances, such as between countries or states, sea transportation is used. For coastal cities with docks, sea transportation can be used.

[0003] Ro-Ro ships need to be equipped with Ro-Ro equipment, such as lifting platforms, ramps, bow / stern ramps, and movable decks, etc., to enable vehicles to enter and exit, and to move between upper and lower decks. The ramp is arranged on one side of the ship and on the dock on the other side, and is a connecting device for vehicles to enter and exit the ship. The ramp is arranged on the adjacent vehicle deck, which can enable vehicles to enter and exit the upper and lower decks. The lifting platform and movable deck are used as Ro-Ro equipment. Its principle is translation. The vehicle is on the lifting platform or movable deck and moves up and down with the equipment.

[0004] Because lifting platforms and movable decks have to bear a large weight plus their own weight, they generally use hydraulics as the power source. The hydraulic cylinder drives the steel wire rope, which is arranged around the equipment and moves up and down with it.

[0005] The lifting platform needs to be loaded. Generally, the lifting platform is designed according to the average weight and symmetrical design. The test is also only carried out once for centering. However, the vehicle may not be able to be parked in the center when it is docked on the lifting platform. There are left and right, front and back offsets. Moreover, ships on the water are also easily affected by waves, causing heel and longitudinal. If the load of the lifting platform is verified for the above situations, it requires special tests to simulate the installation conditions of the actual ship operation vehicle and try to reflect the actual use of the equipment during the experiment. Summary of the invention

[0006] The embodiment of the present invention provides a comprehensive simulated load test method for a ro-ro equipment lifting platform, which simulates the actual use of the lifting platform through a comprehensive lifting platform load test at the dock stage. This test method can most comprehensively reflect the use of the lifting platform, and timely discover and solve problems during the test process, thereby reducing the occurrence of various problems after delivery.

[0007] In order to achieve the above invention purpose, the technical solution provided by the present invention is as follows:

[0008] A comprehensive simulated load test method for a roll-on / roll-off equipment lifting platform, the method specifically comprising the following steps:

[0009] Step 1, symmetrically arranging the load along the longitudinal center axis and the transverse center axis of the lifting platform so that the center of the load is consistent with the center of the lifting platform;

[0010] Step 2, lifting and lowering the lifting platform multiple times for the first time;

[0011] Step 3, tilting the lifting platform along the first axis by an angle α, adjusting the center of the load so that the center of the load is offset by a distance L along the first direction;

[0012] Step 4, lifting and lowering the lifting platform multiple times for the second time.

[0013] Step 5, tilting the lifting platform along the second axis by an angle β, adjusting the center of gravity of the load so that the center of gravity of the load is offset from the second axis;

[0014] Step 6, lifting and lowering the lifting platform for a third time multiple times.

[0015] Further, the load range is 50 tons to 100 tons;

[0016] Furthermore, the first lifting of the lifting platform is 3-10 times;

[0017] Furthermore, the first axis is the central axis in the length direction of the roll-on / roll-off equipment lifting platform;

[0018] Furthermore, the angle α ranges from 1 degree to 8 degrees;

[0019] Furthermore, the first direction is the length direction of the roll-on / roll-off equipment lifting platform;

[0020] Furthermore, the first direction is the width direction of the roll-on / roll-off equipment lifting platform;

[0021] Further, the offset distance L is 100mm-200mm;

[0022] Furthermore, the second lifting of the lifting platform is 2-5 times;

[0023] Further, the first axis and the second axis may be the same;

[0024] Further, the first direction and the second direction may be the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram showing the load arrangement of a lifting platform for equipment according to an embodiment of the present invention;

[0026] Figure 2A schematic diagram showing the arrangement of a left eccentric load on a lifting platform for equipment according to an embodiment of the present invention;

[0027] Figure 3 A schematic diagram showing the arrangement of a right eccentric load on a lifting platform for equipment according to an embodiment of the present invention;

[0028] Figure 4 A schematic diagram showing the arrangement of an eccentric load on the bow of an equipment lifting platform according to an embodiment of the present invention;

[0029] Figure 5 A schematic diagram showing the arrangement of an eccentric load at the stern of a lifting platform for equipment according to an embodiment of the present invention;

[0030] Figure 6 A comprehensive simulated load test method for a roll-on / roll-off equipment lifting platform according to an embodiment of the present invention is presented. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The load test of the lifting platform simulates the number of times the vehicle passes through the lifting platform in a voyage. The following 20 times are used as an example. For example, the test load is 80t, 10 times are completely centered in the normal state, and 10 times simulate the extreme state of the ship heeling and trimming, and the vehicle also deviates in the same direction.

[0033] 10 times in normal state, with the load being the center of gravity and the ship being lifted in positive floating state.

[0034] The heel is to simulate the normal heel of the ship of 3°. On this basis, the center of gravity shifts when the vehicle is docked, and the most extreme case is taken. For example, left heel + left shift, right heel + right shift are the most extreme cases. The ship cannot tilt at the dock, and the ship's tilt needs to be adjusted manually. Here, the anti-heel system is used. The anti-heel system transfers the water in the heel tank from one side of the ship to the other side through the anti-heel pump to achieve the function of the ship tilting.

[0035] The effect of longitudinal tilt is much smaller than that of transverse tilt, because the length of the lifting platform is much greater than the width. The tilt of the ship and the front and rear center of gravity offset are relatively small compared to the original center of gravity. Therefore, the longitudinal tilt is not designed, but only the front and rear offset of the vehicle is designed. For the front and rear offset of the vehicle, we adopt the form of swapping the front and rear of the vehicle, with the front of the vehicle in front and the rear in the back, or the rear of the vehicle in front and the front of the vehicle in the back.

[0036] This test is carried out after completing the load test required by the classification society and is a supplementary test item. The purpose of this experiment is to ensure the stable operation of the equipment to meet the loading requirements of operation after delivery.

[0037] It is to be noted that the longitudinal direction mentioned in the present invention refers to the direction of the bow and stern, the transverse direction refers to the direction perpendicular to the longitudinal direction, the longitudinal inclination refers to the bow or stern tilting downward or upward at an angle, which can also be called forward or backward inclination at an angle; the heel refers to the two sides of the ship tilting downward or upward at an angle. "Left" refers to the left hand side facing the bow, "right" refers to the right hand side facing the bow, "front" refers to the bow direction, and "rear" refers to the stern direction. Since the lifting platform is set in the ship, the "longitudinal", "transverse", "left", "right", "front" and "rear" mentioned above are also the "longitudinal", "transverse", "left", "right", "front" and "rear" corresponding to the lifting platform.

[0038] Specifically, a comprehensive simulated load test method for a roll-on / roll-off equipment lifting platform comprises the following steps:

[0039] Step 1: Arrange the load symmetrically along the longitudinal center line and transverse center line of the lifting platform so that the center of the load is consistent with the center of the lifting platform.

[0040] like Figure 1 As shown in the figure, the X axis represents the longitudinal center axis of the lifting platform, the Y axis represents the transverse center axis of the lifting platform, the direction of arrow A is the bow direction, the intersection O of the X axis and the Y axis is the center of the lifting platform, and 1 in the figure represents the load module, each of which has a load of 10 tons, totaling 80 tons. The load modules are arranged symmetrically along the longitudinal center axis and the transverse center axis of the lifting platform, that is, the overall center of the load module coincides with the center O of the lifting platform.

[0041] Furthermore, the total load range may be 50 tons, 80 tons, or 100 tons.

[0042] Specifically, under different circumstances, the actual load degree of the lifting platform is different. In the test, the appropriate load can be set according to the actual operation of the ship to reflect the actual situation and simulate the comprehensive situation of the lifting platform under the most extreme conditions.

[0043] Step 2, lift the lifting platform several times for the first time.

[0044] Specifically, in the case of the above-mentioned central loading load, lift the lifting platform several times. Check the functions and the status of the wire rope during the operation. Adjust as needed to ensure smooth operation.

[0045] Furthermore, it can be raised and lowered continuously for 3, 5, 8 or 10 times.

[0046] Step 3, tilt the lifting platform along the first axis by an angle α, and adjust the center of the load so that the center of the load is offset by a distance L along the first direction.

[0047] Specifically, the lifting platform is tilted along the X-axis, tilted 3 degrees to the left, and the position of the load module is adjusted so that the center of the load module is offset to the left of the X-axis by about 150 mm. Figure 2 As shown, Figure 2 A schematic diagram of the arrangement of the left eccentric load of an equipment lifting platform according to an embodiment of the present invention is shown.

[0048] In another embodiment, Figure 3 As shown, Figure 3 A schematic diagram of a right eccentric load arrangement of a lifting platform for equipment according to an embodiment of the present invention is shown. The lifting platform can be tilted along the X-axis, tilted 3 degrees to the right, and the position of the load module is adjusted so that the center of the load module is offset to the right of the X-axis by about 150 mm.

[0049] In another embodiment, the lifting platform can be tilted along the X-axis, tilted 3 degrees to the left, and the position of the load module is adjusted so that the center of the load module is offset to the right of the X-axis by about 150 mm.

[0050] In another embodiment, the lifting platform can be tilted along the X-axis, tilted 3 degrees to the right, and the position of the load module is adjusted so that the center of the load module is offset to the left of the X-axis by about 150 mm.

[0051] Furthermore, the inclination angle α can be 0 degree, 1 degree, 3 degrees, 5 degrees, or 8 degrees.

[0052] Furthermore, the offset distance L may be 100 mm, 130 mm, 150 mm, 180 mm, or 200 mm.

[0053] Furthermore, the center of the load is the geometric center of all load modules.

[0054] In another embodiment, the center of the load is the center of gravity of all load modules.

[0055] Specifically, when the tilt angle α is 0 degrees, it is also a situation in the experiment, that is, the lifting platform is not tilted, only the load module is placed asymmetrically.

[0056] Specifically, under different circumstances, the actual maximum heel angle of the ship is different. In the test, the maximum tilt angle can be set according to the actual operation of the ship, so as to reflect the actual situation and simulate the comprehensive situation of the lifting platform under the most extreme conditions.

[0057] Step 4, lift and lower the lifting platform several times for the second time.

[0058] Specifically, in the case of the above-mentioned central loading load, lift the lifting platform several times. Check the functions and the status of the wire rope during the operation. Adjust as needed to ensure smooth operation.

[0059] Furthermore, it can be raised and lowered continuously for 3, 5, 8 or 10 times.

[0060] Step 5, tilt the lifting platform along the second axis by an angle β, and adjust the center of gravity of the load so that the center of gravity of the load is offset from the second axis.

[0061] Specifically, the lifting platform is tilted along the Y axis and tilted forward by 3 degrees, and at the same time, the position of the payload module is adjusted so that the center of gravity of the payload module is offset forward of the Y axis.

[0062] In another embodiment, the lifting platform can be tilted along the Y-axis and tilted backward by 3 degrees, and the position of the payload module can be adjusted so that the center of gravity of the payload module is offset backward from the Y-axis.

[0063] In another embodiment, the lifting platform can be tilted along the Y-axis, tilted forward 3 degrees, and the position of the payload module is adjusted so that the center of gravity of the payload module is offset backward from the Y-axis.

[0064] In another embodiment, the lifting platform can be tilted along the Y-axis, tilted backward by 3 degrees, and the position of the payload module can be adjusted so that the center of gravity of the payload module is offset forward of the Y-axis.

[0065] Specifically, the inclination angle β can be 0 degree, 1 degree, 3 degrees, 5 degrees, or 8 degrees.

[0066] Specifically, the offset distance may be 100 mm, 130 mm, 150 mm, 180 mm, or 200 mm.

[0067] Specifically, when the tilt angle β is 0 degrees, it is also a situation in the experiment, that is, the lifting platform is not tilted, and only the load module is placed asymmetrically.

[0068] Specifically, under different circumstances, the actual maximum heel angle of the ship is different. In the test, the maximum tilt angle can be set according to the actual operation of the ship, so as to reflect the actual situation and simulate the comprehensive situation of the lifting platform under the most extreme conditions.

[0069] Step 6, lift and lower the lifting platform several times for the third time.

[0070] Specifically, in the case of the above-mentioned central loading load, lift the lifting platform several times. Check the functions and the status of the wire rope during the operation. Adjust as needed to ensure smooth operation.

[0071] Furthermore, it can be raised and lowered continuously for 3, 5, 8 or 10 times.

[0072] In another embodiment, step 3 and step 4 are combined as the first step, and step 5 and step 6 are combined as the second step. After step 2, the first step combination may be performed multiple times, and then the second step combination may be performed multiple times.

[0073] Specifically, the multiple times in the previous embodiment may be 2 times, 3 times, 4 times, 5 times or more times.

[0074] In another embodiment, step 3 and step 4 are combined as the first step, and step 5 and step 6 are combined as the second step. After step 2, the first step combination may be performed multiple times, and then the second step combination may be performed multiple times. In the first step combination, the specific conditions of each test may be different. For example, in two first step combinations, the tilt axis of step 3 in the first time may be the X axis, the tilt angle may be 3 degrees, the tilt direction is to the left, and the offset is 150 mm to the left. The tilt axis of step 3 in the second time may also be the X axis, the tilt angle may be 3 degrees, the tilt direction is to the right, and the offset is 150 mm to the right.

[0075] Similarly, after step 4, multiple second step combinations can be performed. In the second step combination, the specific conditions of each test can be different. For example, in two second step combinations, the tilt axis of the first step 5 can be the Y axis, the tilt angle can be 0 degrees, and the center of gravity of the load module is on the right side of the Y axis, that is, close to the bow position, such as Figure 4 The tilt axis of the second step 5 can also be the Y axis, the tilt angle can be 0 degrees, and the center of gravity of the load module is on the left side of the Y axis, that is, close to the stern position.

[0076] During operation, check each function, the operating status of the lifting platform and the wire rope.

[0077] From the above steps, it can be seen that the vehicle simulates various working conditions of the actual vehicle device, unifying the vehicle's offset and the ship's tilt state for verification together to achieve the most comprehensive and practical use of the lifting platform.

[0078] This method simulates the actual use of the lifting platform through a comprehensive lifting platform load test at the dock stage. This experimental method can most comprehensively reflect the use of the lifting platform, discover and solve problems in a timely manner during the experiment, and reduce various problems after delivery.

[0079] It is relatively easy to modify and adjust the problem during the construction process. If the adjustment is made after the ship is delivered, it needs to be repaired in the drydock, which is very time-consuming and laborious, saving the design and maintenance costs for the shipowner. The comprehensive simulation experiment reflects the superiority of the shipyard's design optimization, the ability of scientific and technological innovation, and the good service of the shipyard.

[0080] This experimental method was implemented in a shipyard for the first time. During the experiment, the manufacturer's design and the shipyard's construction accuracy were verified, and the experiment went smoothly. This method is very beneficial to shipowners and has been well received by shipowners.

[0081] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A comprehensive simulated load test method for a ro-ro equipment lifting platform, the method specifically comprising the following steps: Step 1, symmetrically arranging the load along the longitudinal center axis and the transverse center axis of the lifting platform so that the center of the load is consistent with the center of the lifting platform; Step 2, lifting and lowering the lifting platform multiple times for the first time; Step 3, tilting the lifting platform along the first axis by an angle α, adjusting the center of the load so that the center of the load is offset by a distance L along the first direction; Step 4, lifting and lowering the lifting platform multiple times for the second time. Step 5, tilting the lifting platform along the second axis by an angle β, adjusting the center of gravity of the load so that the center of gravity of the load is offset from the second axis; Step 6, lifting and lowering the lifting platform for a third time multiple times.

2. The experimental method as described in claim 1, wherein the load range is 50 tons to 100 tons.

3. The experimental method as described in claim 1, wherein the first lifting of the lifting platform is 3-10 times.

4. The experimental method as described in claim 1, wherein the first axis is the longitudinal center axis of the roll-on / roll-off equipment lifting platform.

5. The experimental method as described in claim 1, wherein the first axis is the transverse center axis of the roll-on / roll-off equipment lifting platform.

6. The experimental method as claimed in claim 1, wherein the angle α is between 1 degree and 8 degrees.

7. The experimental method as described in claim 1, wherein the first direction is the length direction of the roll-on / roll-off equipment lifting platform.

8. The experimental method as described in claim 1, wherein the first direction is the width direction of the roll-on / roll-off equipment lifting platform.

9. The experimental method as claimed in claim 1, wherein the β angle is 0 degrees to 8 degrees.

10. The experimental method according to claim 1, wherein the offset distance L is 100 mm-200 mm.

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